Buffing and grinding apparatus.



PATENTED SEPT. 1, 1908 P. B. DUNCAN. BUFFING AND GRINDING APPARATUS.

APPLICATION FILED JULY 9, 1900.

2 SHEETSSHEET l.

3 m r-fiat; 3 hA'S JHfi/Js.

PATENTED SEPT. 1, 1908.

I. B. DUNCAN.

BUPFING AND GRINDING APPARATUS.

APPLICATION FILED JULY 9, 1900.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FREDERICK B. DUNCAN, OF MADISON, WISCONSIN, ASSIGNOR TO NORTHERN ELEC- TRICAL MANUFACTURING COMPANY, OF MADISON,

WISCONSIN.

WISCONSIN, A CORPORATION OF BUFFING AND GRINDING APPARATUS.

Patented Sept. 1, 1908.

Application filed July 9, 1900. Serial No. 22,919.

To all whom it may concern:

Be it known that I, FREDERICK B. DUN- CAN, a subject of the Queen of Great Britain,

. in is a speclfication.

y invention relates to improvements in bufiing and grinding apparatus and has for its object to provide a new and improved apparatus of this description.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a front view of a device embodying my invention; Fig. 2 is an end view of Fig. 1; Fig. 3 is a longitudinal section through the fan shown in Fig. 1; Fig. 4 is a section on line 4 4, Fig. 3, with parts omitted.

Like letters refer to like parts throughout the several figures.

In the construction and operation of bufi 'ing and grinding machines, certain conditions are met with not present in the construction and operation of other classes of machinery. Buffing and grinding machines, for example, must be ordinarily run at a hi h rate of speed and when in use continuous y produce a large amount of dust and grit, which must be properly taken care of and which produces many evil effects. am le, the device is run from a belt, considera le tenslon must be applied to the belt to keep it in position and obtain theproper speed. The dust and grit from the machine gets into the bearings and this tension causes a rapid deterioration and hence the machine is soon destroyed.

My invention has as its object, among other thin s, to obviate these evils and to properly ta e care of the dust and dirt necessarl y produced when the machine is in operatron, and at the same time provide a self-contained machine. 1

Referring now to the drawings, I have shown one construction embodying myinvention. In this construction, I provide a suitable base A of any desired form; Mountture shaft C. Mounted upon this armature shaft so as to be rotated thereby is a suitable grinding or bufiing wheel D provided with a If, for-ex- 1 suitable protecting hood D There is also mounted upon the armature shaft, so as to be 0 erated thereby, a suitable air moving device, which in this case is illustrated as an exhaust fan E. This air moving device or fan is provided with a suitable inclosing bonnet E having suitable admission and exhaust openings. The admission opening is connected with the air and dust con uctor E leading to the hood of the buffing or grinding wheel. The discharge opening is connected municates with the hollow base A. As shown in Fig. 1, the armature shaft is extended in both directions and two buffing or grinding wheels are used, one placed on each side of the motor, both being provided with protecting hoods D and having air and dust conductors E leading therefrom to the air moving device.

The air moving device or fan. E is illustrated in detail in Fig. 3 and'consists of a series of vanes E attached to a suitable hub E mounted upon the armature shaft. This fan is located in an inclosmg device F within the bonnet E This inclosing device practically divides the bonnet into two chambers F and F The air and dust conductors E leading from the hoods of the grinding and buffing wheels are connected with the chamber F through the openingsF. The chamber F is separated from the motor by means of a shitable partition and communicates with the fan chamber through the side open ing .F. The discharge conductor E leads from the fan chamber F (see Fig. 4). The radius of the fan chamber gradually increases from the edge E of the opening to the exhaust conductor, as shown in Fig. 4. At this edge E the radius is substantially the length of the radius of the fan, there being only suflicient room to ermit the free movement of the vanes. on an electric motor is used, the controlling device or rheostat or the like is located in any suitable place, and hence each machine may be separately con trolled. The hoods D for the wheels D with the air and dust conductors leading therefrom provide a simple and eflicient means for getting rid of the dust. I

It will be seen that each device, when constructed as herein shown'and described, is self-contained, is independent of any other machine or exterior piping arrangement and with the discharge conductor E, which com- I any manner disturbing other machines or any set construction or arran ement. 'It

' will also be seen that the evil e ects of the dust on the bearings and the like are reduced to a minimum, there being no belt strain of any kind, and that. the greatest efliciency of drive is produced, thus securing economy of power and convenienceof handling.

The electric motor is provided with a protecting covering, which incloses it and protects it from the dust. I have'not shown the construction of the motor in detail, as any desired electric motor may be used for this purpose.

I claim:

1. In a bufiing or grinding device the combination of a supporting hollow base with a hood or cap or cover mounted thereon, suit-. able bearings mounted thereon provided with grinding Wheels, one at each end ofa shaft which is mounted in said bearings, an

electric motor mounted upon said base and within said hood, its rotating part attached to said shaft, a fan attached to said shaft and driven thereby, air ducts leading from the grinding wheels to the fan, a connection from the fan space to the base so that the material drawn from the grinding wheels may be discharged into the base, a door for removing such material from the base, and a suitable partition in the hood to separate the moving parts of the motor from the fan, all substanse'moai tially as described and forthe purposes specified.

2. In combinatioman electric motor hav' ing a bonnet removably secured against one end of the motor frame, said bonnet having a space or chamber formed in it, a partition separating the space and the bonnet from the interior of the motor, a bearing for the armature shaft'of the motor carried by said bonnet, a fan carried by the armature shaft of the motor between the bearing and partition, a tool carried b the outer end of the armature shaft, a hood for said tool, a pipe or conductor leading from said hood to the space within said bonnet, and a dischar e conductor or pipe leading away from said onnet.

3. In a buffing and vgrinding device, a motor, a grinding device mounted upon the motor-shaft, a hood about said grinding device, a bonnet arranged between the grinding device and the motor, a fan-chamber arranged within said bonnet and communicating with the interior thereof on ,the'side adjacent v the motor, a revolving fan mounted on-the motor-shaft and arranged within said chamber, and means connecting the hood to the bonnet at a point adjacent the side of the fanchamber nearest the motor.

FREDERICK B, DUN CAN. 

